voider vs defecator

voider and defecator both are nouns.

Word	Noun	Adjective	Verb	Adverb
voider	Yes	No	No	No
defecator	Yes	No	No	No

As nouns, voider and defecator are synonyms defined as:

Other synonyms of voider include shitter.

voider (noun)	defecator (noun)
a hamper that holds dirty clothes to be washed or wet clothes to be dried	(obsolete) that which cleanses or purifies; especially, an apparatus for removing the feculencies of juices and syrups.
a piece of chain mail covering a place unprotected by armor plate	a person who defecates
an official who can invalidate or nullify
a person who defecates